Hi, my name is Diego Sandoval and I am designing and FIRE FIGHTING SYSTEM.
I have a question related to NFPA 20. I want to know if I can return the relieves towards suction lines in FIRE PUMPS WITH DIESEL ENGINES without circulation relief valves.
According to section A.20.7.1; I can do that if I include a circulation relief valve; however, section A.13.1.8 mentions that circulation relief valves dont apply for FIRE PUMPS WITH DIESEL ENGINES.
Also, the section A.4.20.1 mentions that I can discharge in suction lines, but I am not sure if I need that circulation relief valve.
I attach a PICTURE of this case.